Phase delay element for transmissive and reflective type...

Details Phase delay element for transmissive and reflective type... Phase delay element for transmissive and reflective type...

2005-07-19

2010-02-02

Dudek, James A (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

Reexamination Certificate

active

07656480

ABSTRACT:
A phase delay element includes a brightness enhancement layer intermediate a reflection layer and an artificial light. The brightness enhancement layer is defined by a first surface and an opposite second surface. The first surface faces the reflection layer. A first light from the artificial light is incident on the second surface. A phase of the first light is delayed by about ¼ phase (λ/4) so that a second light is emitted from the first surface toward the reflection layer. The second light is reflected from the reflection layer so that a third light is emitted from the reflection layer toward the first surface. A phase of the third light is delayed by about ¼ phase (λ/4) so that a fourth light is emitted from the second surface. Therefore, a portion of the artificial light, which is reflected from the reflection layer, is recycled to improve a luminance of an LCD apparatus.

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European Search Report; Application No. 05015191.9-2205; Date Jan. 13, 2006.
European Office Action; 05015191.9—2005; Jul. 24, 2007. All references cited in the foreign Office action and not previously submitted are listed above.

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